United States. Bureau of Labor Statistics. "National Compensation Survey: Pilot Test, St. Louis, MO-IL, March 1997 : Bulletin of the United States Bureau of Labor Statistics, No. 3090-14,"
National Compensation Survey (Wages and Salaries)
(October 1997).
https://fraser.stlouisfed.org/title/6009/item/582254, accessed on September 4, 2026.